Black Bay GMTThe TUDOR Black Bay GMT is made of the right stuff. First off, it sports an incredibly useful multiple time zone complication also known as a GMT function that establishes local time without losing sight of the time in two other time zones. Recognisable by its rotatable bezel, which borrows its deep blue and burgundy color scheme from other models in the Black Bay line, but in a matte version, the Black Bay GMT is also a nod to the early days of this